The so-called car, of course, refers to the products specially used in cars, which are convenient to use in automobile sports. The most common are car MP3, MP4, GPS, car DVD, car hard disk, car power supply, car refrigerator, car massager, car computer, car TV, car hard disk, car air purifier, car U disk video recorder and so on. Famous brands in the car: Cape, Haikang, Dahua and Ma Shuo. The use of these on-board products generally requires the power supply of on-board cigarette lighters. Vehicle-mounted products have penetrated into people's daily life, which is convenient for everyone's life.